ubuntu systemctl 开机时间_零基础Docker学习笔记5：docker ubuntu sshd开机启动

按照笔记4中的方法docker 容器ubuntu已经配置好ssh服务，可是每次重启ubuntu之后，直接ssh提示下面错误，进去之后发现sshd服务没有开机启动，手动起来之后就可以了，但是重启之后还是not running的，忧桑！

root@instance-1:~# ssh s1
ssh: connect to host s1 port 22: Connection refused
root@instance-1:~# docker exec -it 84b3ba091fe2 /bin/bash
root@ubuntu01:/# service ssh status
 * sshd is not running
root@84b3ba091fe2:/# systemctl enable ssh
Synchronizing state of ssh.service with SysV service script with /lib/systemd/systemd-sysv-install.
Executing: /lib/systemd/systemd-sysv-install enable ssh
root@84b3ba091fe2:/# systemctl status ssh
System has not been booted with systemd as init system (PID 1). Can't operate.

由于默认的ubuntu:latest版本是18.04,没有/etc/rc.local，想要设置为开机启动的话，就需要使用systemctl enable ssh指令，但是docker并没有给ubuntu systemctl权限，只能enable/disable，没办法~~~

不过从网上找到了一个ubuntu16.04的版本，经过修改sshd_config，之后做了我自己的镜像，开机后sshd可以自动起来。

如果需要只需要 docker pull elaizqu/ubuntu16.04:sshd 即可下载使用。

https://blog.csdn.net/qq_27068845/article/details/77015432

#ubuntu18.04 sshd 服务指令
# 开机自动启动ssh命令
sudo systemctl enable ssh

# 关闭ssh开机自动启动命令
sudo systemctl disable ssh

# 单次开启ssh
sudo systemctl start ssh

# 单次关闭ssh
sudo systemctl stop ssh

# 设置好后重启系统
reboot

#查看ssh是否启动，看到Active: active (running)即表示成功
sudo systemctl status ssh

另外，试了一下centos，开始也是不行，因为不具有systemctl权限，但是通过添加权限之后，即可。参考链接如下，只有在生成容器的时候添加--privileged=true和/user/sbin/init，其他设置和之前都一样，进入到容器后执行systemctl enable ssh 即可。

ubuntu18.04也尝试了这种方法，但不好使，有大神解决的话麻烦留言告知！！

https://blog.csdn.net/song121/article/details/83022557​blog.csdn.net

root@instance-1:~# docker images
REPOSITORY                    TAG                 IMAGE ID            CREATED             SIZE
elaizqu/ubuntu16.04           sshd                108daf4f6324        15 minutes ago      336MB
elaiz/ubuntu                  ssh                 d4cbb2e50830        20 hours ago        242MB
elaizqu/ubuntu                ssh                 a3d45c79340a        2 days ago          245MB
elaizqu/centos                git                 ccba7fafa06f        2 days ago          624MB
elaizqu/centos                ssh                 abcd4764f162        2 days ago          506MB
elaizqu/centos                screen              270f1e9aad7a        2 days ago          308MB
ubuntu                        latest              3556258649b2        5 days ago          64.2MB
centos                        latest              9f38484d220f        4 months ago        202MB
hello-world                   latest              fce289e99eb9        6 months ago        1.84kB
hub.c.163.com/public/ubuntu   16.04-tools         1196ea15dad6        2 years ago         336MB
root@instance-1:~# docker run -itd --hostname ubuntu16_04 --name ubuntu16.04 elaizqu/ubuntu16.04:sshd
0ad75b6b5d5504c1ef9d2dc8eee3a8ac80920dcc4b3a69c0467b7afaa5cc72fa
root@instance-1:~# docker ps 
CONTAINER ID        IMAGE                      COMMAND                  CREATED             STATUS              PORTS               NAMES
0ad75b6b5d55        elaizqu/ubuntu16.04:sshd   "/usr/bin/supervisord"   26 seconds ago      Up 15 seconds       22/tcp              ubuntu16.04
728f8421b392        abcd4764f162               "/usr/sbin/init"         29 hours ago        Up 6 hours                              centos1
44c1b1ee0143        a3d45c79340a               "/bin/bash"              47 hours ago        Up 6 hours                              ubuntu04
f7711f26887f        a3d45c79340a               "/bin/bash"              47 hours ago        Up 6 hours                              ubuntu03
0efb28e952d0        a3d45c79340a               "/bin/bash"              47 hours ago        Up 6 hours                              ubuntu02
84b3ba091fe2        a3d45c79340a               "/bin/bash"              47 hours ago        Up 5 hours                              ubuntu01
root@instance-1:~# docker exec -it 0ad75b6b5d55 /bin/bash
root@ubuntu16_04:/# service ssh status
 * sshd is running
root@ubuntu16_04:/# ifconfig 
eth0      Link encap:Ethernet  HWaddr 02:42:ac:11:00:07  
          inet addr:172.17.0.7  Bcast:172.17.255.255  Mask:255.255.0.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:10 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:788 (788.0 B)  TX bytes:0 (0.0 B)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
root@ubuntu16_04:/# passwd root
Enter new UNIX password: 
Retype new UNIX password: 
passwd: password updated successfully
root@ubuntu16_04:/# read escape sequence
root@instance-1:~# ssh 172.17.0.7
[email protected]'s password: 
Welcome to Ubuntu Xenial Xerus (development branch) (GNU/Linux 4.9.0-9-amd64 x86_64)

 * Documentation:  https://help.ubuntu.com/
Last login: Mon Jul 29 03:02:34 2019 from 172.17.0.1
root@ubuntu16_04:~# logout
Connection to 172.17.0.7 closed.
root@instance-1:~# docker restart 0ad75b6b5d55 
0ad75b6b5d55
root@instance-1:~# ssh 172.17.0.7
[email protected]'s password: 
Welcome to Ubuntu Xenial Xerus (development branch) (GNU/Linux 4.9.0-9-amd64 x86_64)

 * Documentation:  https://help.ubuntu.com/
Last login: Mon Jul 29 03:27:49 2019 from 172.17.0.1
root@ubuntu16_04:~# 

ps:至于docker attach 与docker exec进入容器有何不同还需要研究，比如上面这个ubuntu16.04就不可以用attach进入，只能用exec。。。